Loom stop motion



May 6, 1969 J. H. NYDAM LOOM STOP MOTION Filed July 27, 1967 NVNTOR'l/H/V V. Mya/4M BY i QM 0M ATTORNEY United States Patent O U.S. Cl.139-370 5 Claims ABSTRACT OF THE DISCLOSURE A stop motion for looms ofthe type adapted to insert pre-measured lengths of filling into shedsformed by warp threads having a means for stopping said loom upondetection of the absence of filling or a length of filling which doesnot completely traverse the width of the shed.

BACKGROUND OF THE INVENTION The invention relates to shuttleless loomsin which the ends of pre-measured picks extend from the edge of thefabric in the form of a so-called fringe.

Many mechanisms have been tried or are in use to sense the presence orabsence of filling yarn within the warp sheds as fabric is being formed.

Until the introduction of the present invention no positive orsatisfactory means has been employed to stop a loom in which a shortpick has been inserted or in other words a length of filling yarn whichtravels beyond the center of its shed but fails to reach the end of itsinsertion path.

Without an adequate means for detecting a short pick and instantlystopping the loom to correct such a condition, inferior fabric will beformed until this weaving discrepancy is visually detected.

The loom stop motion according to the instant invention provides a meansfor stopping a loom instantly in the event of absence of filling yarn inthe shed or in the event of a so-called short pick which has nottraveled its intended distance through and beyond the limits of itsparticular shed.

A form of filling or weft thread control device for looms of theshuttleless type is shown and described in U.S. Patent 3,260,283.Although the thread control device disclosed in this patent is regardedas the closest prior art, it fails to disclose the positive andnon-complex means for stopping a loom as a result of a short orincomplete pick.

SUMMARY OF THE INVENTION The stop motion of the present invention isdisposed adjacent the fabric edge and by means of a depending flexibleyarn sensing element that forms a part of the looms conventionalelectrical stop motion circuit, the loom is stopped when filling yarn islacking by contacting a second element to complete or break saidelectrical circuit.

The sensing element is in the form of a flexible depending wire loopthat is supported by the looms reed and is adapted to function incooperation with a leno attachment that is disposed in close proximitywith that edge of the fabric from which the ends of filling yarn extend.

Prior to the crossing of the leno yarns the ends of each filling yarninserted are caused to pass through the sheds formed by leno yarn whichwhen crossed securely hold said ends.

As the looms lay moves forwardly with its reed and the sensing elementthe latter will detect the presence of filling and be deflectedrearwardly to avoid contact With the aforementioned second element thatwould complete the electrical circuit for stopping the loom.

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If the filling is absent, or is not of sufficient length to be held bythe yarns of the leno attachment, the sensing element on its forwardmovement with the reed meets no resistance and will contact the circuitssecond element or so-called contact member thereby completing the stopmotion circuit.

A particular advantage of stopping a loom' in the manner described aboveenables a weaver to draw out the incomplete picks of yarn and by simplyletting back on the take-up the distance taken up by the faulty picks,the loom may again be started without causing a defect in the fabric.

BRIEF DESCRIPTION OF THE DRAWING t FIG. l is a perspective view of aportion of the righthand side of a shuttleless loom showing the stopmotion according to the invention applied thereto;

FIG. 2 is a view in side elevation showing the sensing element deflectedrearwardly by the presence of filling yarn; and

. FIG. 3 is a view similar to that of FIG. 2 and partially in sectionshowing the sensing element making contact with the contact member tocomplete the stop motion circuit.

DESCRIPTION OF THE PREFERRED EMBODIMENT Now referring to the figures ofdrawing enough of a shuttleless loom is shown in FIG. 1 to serve as abasis fOr a. detailed description of the invention applied thereto.

The forward upper right-hand side of a loom shown in FIG. 1 shows a laybeam 10 which is caused to reciprocate to and fro in a known mannerduring the performance of its intended function.

A reed 11 is secured to the lay 10 and extending in a generally upwarddirection the dents 12 thereof form the usual openings through which themultiplicity of Warp yarns 13 are adapted to extend.

By means of a conventional harness motion (not shown) the warp yarns 13are caused to cross alternately to form sheds into which a filling yarn14 is inserted.

The fabric is identified by numeral 1'5 and the fell thereof by numeral16.

Temples are disposed in the usual location for maintaining the newlyformed fabric at a desired width. The right-hand temple only is shown inFIG. 1 and is identified generally by numeral 17. The temple pod isshown at 18 and the roll itself at 19 which is supported for rotation ona stud 20. Stud 20 is iixedly held lin and extends laterally from oneend of a temple support bracket 21. The opposite end of this templesupport bracket assembles on a shaft 22 which extends across the widthof the loom and provides a means for alignment of one temple with theother. Both the right and left-hand temple support brackets are ofsimilar configuration and as shown in FIG. 2 the right-hand bracketshows a portion of an integrally formed depending lug element 23 whichprovides a means for attachment of the bracket to the upper forwardportion of the looms framework not shown.

A leno attachment (not shown) is provided and the yarns thereof whichextend in parallel and spaced relation to the warp yarns 13 areidentified by numeral 24.

A stop motion support element 25 is attached to the temple supportbracket 21 by means of screws 26 (FIGS. l and 2) and extending in anupwardly direction the upper portion thereof supports a stop motioncontact member generally indicated by numeral 27. This contact memberincludes a core 28 (FIG. 3) assembled within and longitudinally movablewith an adjustable sleeve 29. Sleeve 29 is made of a non-conductivematerial and is threaded for a greater portion of its length as shown inFIG. 2. The threaded portion of this sleeve assembles within a tappedhole 30 (FIG. 2) provided in the upper portion of the support element 25and by means of an integrally formed knob 31, said sleeve can be turnedto move it and the core 28 therein longitudinally relative to the axisof said core.

The core 28 is in the form of a round head bolt with the head portion 32being unprotected by the sleeve 29. The opposite end of the core isthreaded as shown in FIG. 3 and is positioned within the recess 33 ofthe knob 31. This threaded portion of the core is Provided with a pairof nuts 34 with a terminal connection 35 assembled therebetween.

An electrical lead 36 extending from the terminal connection 35 is incircuit with the looms conventional stop motion and in a manner now tobe described will complete the circuit for stopping a loom in the eventof a short pick or the absence of a pick.

A contact block 37 is fixed to the upper surface of the reed 11 andadjacent the end thereof as shown in FIG. 1. The forward portion of theblock is provided with a sensing element 38 which depends from saidblock in the form of a wire loop and a number of the leno yarns 24 areadapted to pass through this loop.

Additionally, the contact block is provided with a depending pickengaging member 39 which is disposed in spaced relation to and extendsin a plane parallel with the sensing element 38.

In operation, the lay andreed are caused to move to and fro in a knownmanner and the warp yarns 13 along with the leno yarns 24 arealternately crossed forming sheds into which pre-measured length offilling yarn 14 are inserted.

When the filling yarn is properly inserted it will as shown in FIG. 1extend through and beyond the sheds formed by the warp and leno yarns.As the lay and reed move forwardly the filling yarn is first contactedby the pick engaging member 39 which serves to straighten the endthereof should it attempt to curve or twist back in the direction of theshed. The yarn is then engaged by the sensing element 38 which deflectedrearwardly to avoid contact with the head portion 32 of the core 28.

If filling yarn is lacking, or has not traveled a sufficient distance toenter the leno shed, the sensing element meets no resistance as it movesforwardly with the reed and when contact is made with the head portion32 by said sensing element, the stop motion circuit is completed t causea cessation of power to the loom.

The sensing element 38 and contact block 37 are grounded through to theframework of the loom and serve to complete the stop motion circuit whencontact is made between said sensing element and the head portion 32 ofthe core 28.

While one embodiment of the invention has been disclosed, it is to beunderstood that the inventive concept may be carried out in a number ofways. This invention is, therefore, not to be limited to the precisedetails described, but is intended to embrace al1 variations andmodifications thereof falling with the spirit of the invention and thescope of the claims.

I claim:

1. For a loom including a recipricating lay with a reed for positioningduring the forward movement thereof a filling yarn at the fabric fellwhich is of pre-measured length drawn from an outside source of supplyand inserted into and beyond the limits of a shed formed by warp threadsand a leno shed formed by leno yarns extending through said reed, afilling yarn stop motion including (a) a sensing element comprising aflexible wire loop carried by a contact block fixed to and movable withsaid reed for detecting the presence and absence of filling yarn in ashed, said wire loop having a portion of said leno yarns extendingtherethrough, and

(b) a contact member for completing a circuit for stopping the loom byengaging said sensing element on the forward movement thereof in theevent of absence of lling yarn and to resist engagement when fillingyarn is present.

2. The mechanism according to claim 1 wherein said contact member islongitudinlly adjustable to and from a position to place it in closeproximity with said sensing element in its forward most position.

3. The mechanism according to claim 1 wherein said contact member iselectrically insulated to prevent false indications for loom stoppage.

4. The mechanism according to claim 1 wherein said contact member isfixedly positioned relative to said sensing element.

5. The mechanism according to claim 1 wherein said contact block furtherincludes a pick engaging member for contacting the end of the fillingyarn to prevent displacement thereof.

Referenees Cited UNITED STATES PATENTS 1,301,280 4/1919 Lanning 139-3722,389,809 11/1945 Moessinger 139-54 X 2,469,200 5/ 1949 Matweelf 139-372X 3,215,167 11/1965 Nichols 139-376 3,242,949 3/ 1966 Taticek 139-543,260,283 7/1966 Svaty et al 139-370 3,289,709 12/1966 Llado 139-370FOREIGN PATENTS 1,019,724 2/ 1966 Great Britain.

JAMES KEE CHI, Primary Examiner.

